Servlet Annotation WebServlet Example

First example to show Servlet Welcome. For this we have created index.html page on index.html we have created a link. on click at link it will call welcome servlet.

Our project directory structure is as below

1_expo

index.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>First page</title>
    </head>
    <body>
        <h1><a href="welcome">Show welcome servlet</a> </h1>
    </body>
</html>

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<title>First page</title>

</head>

<body>

<h1><a href="welcome">Show welcome servlet</a> </h1>

</body>

</html>

Welcome.java

package ebhor.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(name = "Welcome", urlPatterns = {"/welcome"})
public class Welcome extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet Welcome</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet Welcome </h1>");
            out.println("</body>");
            out.println("</html>");
        } finally {
            out.close();
        }
    }

}

package ebhor.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

@WebServlet(name = "Welcome", urlPatterns = {"/welcome"})

public class Welcome extends HttpServlet {

@Override

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html;charset=UTF-8");

PrintWriter out = response.getWriter();

try {

out.println("<!DOCTYPE html>");

out.println("<html>");

out.println("<head>");

out.println("<title>Servlet Welcome</title>");

out.println("</head>");

out.println("<body>");

out.println("<h1>Servlet Welcome </h1>");

out.println("</body>");

out.println("</html>");

} finally {

out.close();

}

@WebServlet(name = “Welcome”, urlPatterns = {“/welcome”}) here urlPattern maps /welcome to Welcome.java.
<a href=”welcome”>Show welcome servlet</a> call to doGet() method of Welcome.java because anchor tag calls http get method so it is handled by servlets doGet() method.

Result
1_first

1_second

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